NTA JEE Main 9th April 2013 Online - Chemistry

NTA JEE Main 9th April 2013 Online - Chemistry - Question 31

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In an atom how many orbital(s) will have the quantum numbers; $$n = 3$$, $$l = 2$$ and $$m_l = +2$$?

A

5

B

3

C

1

D

7

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NTA JEE Main 9th April 2013 Online - Chemistry - Question 32

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Electron gain enthalpy with negative sign of fluorine is less than that of chlorine due to :

A

High ionization enthalpy of fluorine

B

Smaller size of chlorine atom

C

Smaller size of fluorine atom

D

Bigger size of 2p orbital of fluorine

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NTA JEE Main 9th April 2013 Online - Chemistry - Question 33

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Which one of the following molecules is polar?

A

$$XeF_4$$

B

$$IF_5$$

C

$$SbF_5$$

D

$$CF_4$$

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NTA JEE Main 9th April 2013 Online - Chemistry - Question 34

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In which of the following ionization processes the bond energy has increased and also the magnetic behaviour has changed from paramagnetic to diamagnetic?

A

$$NO \rightarrow NO^+$$

B

$$N_2 \rightarrow N_2^+$$

C

$$C_2 \rightarrow C_2^+$$

D

$$O_2 \rightarrow O_2^+$$

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NTA JEE Main 9th April 2013 Online - Chemistry - Question 35

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By how many folds the temperature of a gas would increase when the root mean square velocity of the gas molecules in a container of fixed volume is increased from $$5 \times 10^4$$ cm/s to $$10 \times 10^4$$ cm/s?

A

Two

B

Three

C

Six

D

Four

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NTA JEE Main 9th April 2013 Online - Chemistry - Question 36

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Given: (I) $$H_2(g) + \frac{1}{2}O_2(g) \rightarrow H_2O(l)$$; $$\Delta H°_{298K} = -285.9$$ kJ mol$$^{-1}$$
(II) $$H_2(g) + \frac{1}{2}O_2(g) \rightarrow H_2O(g)$$; $$\Delta H°_{298K} = -241.8$$ kJ mol$$^{-1}$$
The molar enthalpy of vapourisation of water will be :

A

241.8 kJ mol$$^{-1}$$

B

22.0 kJ mol$$^{-1}$$

C

44.1 kJ mol$$^{-1}$$

D

527.7 kJ mol$$^{-1}$$

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NTA JEE Main 9th April 2013 Online - Chemistry - Question 37

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In reaction $$A + 2B \rightleftharpoons 2C + D$$, initial concentration of B was 1.5 times of [A], but at equilibrium the concentrations of A and B became equal. The equilibrium constant for the reaction is :

A

8

B

4

C

12

D

6

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NTA JEE Main 9th April 2013 Online - Chemistry - Question 38

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Solid $$Ba(NO_3)_2$$ is gradually dissolved in a $$1.0 \times 10^{-4}$$ M $$Na_2CO_3$$ solution. At which concentration of $$Ba^{2+}$$, precipitate of $$BaCO_3$$ begins to form? ($$K_{sp}$$ for $$BaCO_3 = 5.1 \times 10^{-9}$$)

A

$$5.1 \times 10^{-5}$$ M

B

$$7.1 \times 10^{-8}$$ M

C

$$4.1 \times 10^{-5}$$ M

D

$$8.1 \times 10^{-7}$$ M

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NTA JEE Main 9th April 2013 Online - Chemistry - Question 39

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Given : $$XNa_2HAsO_3 + YNaBrO_3 + ZHCl \rightarrow NaBr + H_3AsO_4 + NaCl$$
The values of X, Y and Z in the above redox reaction are respectively :

A

2, 1, 2

B

2, 1, 3

C

3, 1, 6

D

3, 1, 4

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NTA JEE Main 9th April 2013 Online - Chemistry - Question 40

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Sodium Carbonate cannot be used in place of $$(NH_4)_2CO_3$$ for the identification of $$Ca^{2+}$$, $$Ba^{2+}$$ and $$Sr^{2+}$$ ions (in group V) during mixture analysis because :

A

$$Mg^{2+}$$ ions will also be precipitated.

B

Concentration of $$CO_3^{2-}$$ ions is very low.

C

Sodium ions will react with acid radicals.

D

$$Na^+$$ ions will interfere with the detection of $$Ca^{2+}$$, $$Ba^{2+}$$, $$Sr^{2+}$$ ions.

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NTA JEE Main 9th April 2013 Online - Chemistry - Question 41

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Which one of the following is most stable?

A

B

C

D

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NTA JEE Main 9th April 2013 Online - Chemistry - Question 42

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Rate of dehydration of alcohols follows the order:

A

$$2° > 1° > CH_3OH > 3°$$

B

$$3° > 2° > 1° > CH_3OH$$

C

$$2° > 3° > 1° > CH_3OH$$

D

$$CH_3OH > 1° > 2° > 3°$$

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NTA JEE Main 9th April 2013 Online - Chemistry - Question 43

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Which of the following compounds is not expected to show Lassaignes' test for nitrogen?

A

Propanenitrile

B

Hydroxylamine hydrochloride

C

Nitromethane

D

Ethanamine

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NTA JEE Main 9th April 2013 Online - Chemistry - Question 44

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The addition of HI in the presence of peroxide catalyst does not follow anti-Markovnikov's rule because :

A

HI is a strong reducing agent.

B

H-I bond is too strong to be broken homolytically.

C

I atom combines with H atom to give back HI.

D

Iodine atom is not reactive enough to add across a double bond.

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NTA JEE Main 9th April 2013 Online - Chemistry - Question 45

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An element having an atomic radius of 0.14 nm crystallizes in an $$f_{cc}$$ unit cell. What is the length of a side of the cell?

A

0.56 nm

B

0.24 nm

C

0.96 nm

D

0.4 nm

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NTA JEE Main 9th April 2013 Online - Chemistry - Question 46

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12 g of a nonvolatile solute dissolved in 108 g of water produces the relative lowering of vapour pressure of 0.1. The molecular mass of the solute is :

A

80

B

60

C

20

D

40

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NTA JEE Main 9th April 2013 Online - Chemistry - Question 47

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Electrode potentials (E°) are given below :
$$Cu^+/Cu = +0.52$$ V,
$$Fe^{3+}/Fe^{2+} = +0.77$$ V,
$$\frac{1}{2}I_2(s)/I^- = +0.54$$ V,
$$Ag^+/Ag = +0.88$$ V.
Based on the above potentials, strongest oxidizing agent will be :

A

$$Cu^+$$

B

$$Fe^{3+}$$

C

$$Ag^+$$

D

$$I_2$$

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NTA JEE Main 9th April 2013 Online - Chemistry - Question 48

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The instantaneous rate of disappearance of $$MnO_4^-$$ ion in the following reaction is $$4.56 \times 10^{-3}$$ Ms$$^{-1}$$
$$2MnO_4^- + 10I^- + 16H^+ \rightarrow 2Mn^{2+} + 5I_2 + 8H_2O$$
The rate of appearance of $$I_2$$ is :

A

$$4.56 \times 10^{-4}$$ Ms$$^{-1}$$

B

$$1.14 \times 10^{-2}$$ Ms$$^{-1}$$

C

$$1.14 \times 10^{-3}$$ Ms$$^{-1}$$

D

$$5.7 \times 10^{-3}$$ Ms$$^{-1}$$

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NTA JEE Main 9th April 2013 Online - Chemistry - Question 49

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The migration of dispersion medium under the influence of an electric potential is called :

A

Cataphoresis

B

Electroosmosis

C

Electrophoresis

D

Sedimentation

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NTA JEE Main 9th April 2013 Online - Chemistry - Question 50

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Calcination is the process in which:

A

ore is heated above its melting point to expel $$H_2O$$ or $$CO_2$$ or $$SO_2$$

B

ore is heated below its melting point to expel volatile impurities

C

ore is heated above its melting point to remove S, As and Sb as $$SO_2$$, $$As_2O_3$$ and $$Sb_2O_3$$ respectively

D

ore is heated below its melting point to expel $$H_2O$$ or $$CO_2$$

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NTA JEE Main 9th April 2013 Online - Chemistry - Question 51

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Trigonal bipyramidal geometry is shown by:

A

$$XeOF_2$$

B

$$XeO_3F_2$$

C

FXeOSO$$_2$$F

D

$$[XeF_5]^{2-}$$

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NTA JEE Main 9th April 2013 Online - Chemistry - Question 52

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Potassium dichromate when heated with concentrated sulphuric acid and a soluble chloride, gives brown-red vapours of :

A

$$CrO_3$$

B

$$CrCl_3$$

C

$$CrO_2Cl_2$$

D

$$Cr_2O_3$$

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NTA JEE Main 9th April 2013 Online - Chemistry - Question 53

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The element with which of the following outer electron configuration may exhibit the largest number of oxidation states in its compounds :

A

$$3d^54s^2$$

B

$$3d^84s^2$$

C

$$3d^74s^2$$

D

$$3d^64s^2$$

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NTA JEE Main 9th April 2013 Online - Chemistry - Question 54

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Type of isomerism which exists between $$[Pd(C_6H_5)_2(SCN)_2]$$ and $$[Pd(C_6H_5)_2(NCS)_2]$$ is :

A

Linkage isomerism

B

Coordination isomerism

C

Ionisation isomerism

D

Solvate isomerism

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NTA JEE Main 9th April 2013 Online - Chemistry - Question 55

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X is:

A

B

C

D

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NTA JEE Main 9th April 2013 Online - Chemistry - Question 56

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Aryl fluoride may be prepared from arene diazonium chloride using :

A

$$HBF_4/\Delta$$

B

$$HBF_4/NaNO_2$$, Cu, $$\Delta$$

C

CuF/HF

D

Cu/HF 0

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NTA JEE Main 9th April 2013 Online - Chemistry - Question 57

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An ether (A), $$C_5H_{12}O$$, when heated with excess of hot concentrated HI produced two alkyl halides which when treated with NaOH yielded compounds (B) and (C). Oxidation of (B) and (C) gave a propanone and an ethanoic acid respectively. The IUPAC name of the ether (A) is :

A

2-ethoxypropane

B

ethoxypropane

C

methoxybutane

D

2-methoxybutane

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NTA JEE Main 9th April 2013 Online - Chemistry - Question 58

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Formaldehyde can be distinguished from acetaldehyde by the use of :

A

Schiff's reagent

B

Tollen's reagent

C

$$I_2$$/Alkali

D

Fehling's solution

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NTA JEE Main 9th April 2013 Online - Chemistry - Question 59

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If a polythene sample contains two monodisperse fractions in the ratio 2 : 3 with degree of polymerization 100 and 200, respectively, then its weight average molecular weight will be :

A

4900

B

4600

C

4300

D

5200

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NTA JEE Main 9th April 2013 Online - Chemistry - Question 60

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Which of the following enzyme converts starch into maltose?

A

Diastase

B

Maltase

C

Zymase

D

Invertase

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